I didn't think you would. But even a second's lapse is long enough for a professional assassin.

[Nagisa, himself, is about as calm as if he were just waiting for an ordinary class to start. He mentions assassins casually, it may have only been a year but his training as a hitman and his ordinary school life were inextricably linked.]

I'm not going to say you need to spill your guts or anything, this really isn't the time. Just that if something's bothering you, you don't have to try and manage it alone.